Wu Mi, Wang Hongzhao, Mao Haifang, Wang Chaoyang, Dong Zhenbiao, Tang Ting, Zheng Wei, Jin Lehong, Liu Jibo
School of Chemical and Environmental Engineering, Shanghai Institute of Technology 100 Haiquan Road Shanghai 201418 China
Hangzhou Normal University, College of Medicine 2318 Yuhangtang Road Hangzhou Zhejiang China
RSC Adv. 2022 Feb 14;12(9):5245-5254. doi: 10.1039/d1ra08256f. eCollection 2022 Feb 10.
According to the requirements for sustainable development, reclaiming fine chemicals from wastewater under mild conditions is an extremely significant line of research. A low-cost and high-efficiency polydentate chelate- and polymeric Co(ii)-based complex (Co-L)-loaded CN photocatalyst (Co-L/CN) was constructed and used to convert aromatic mandelic acids in wastewater at room temperature. The BET specific surface area increased from 28 m g to 68 m g, indicating its excellent absorptive character. The light absorption range of Co-L/CN reached 650 nm, while the band energy reduced to 2.30 eV, which caused a significant enhancement in photocatalytic activity. The conversion of substituted mandelic acids was more than 90% due to the photoactivity of Co-L/CN. Time-resolved PL spectra indicated the remarkable separation of the photogenerated electron-hole pairs in Co-L/CN. Furthermore, the UV-vis and FTIR spectra indicated the formation of aldehyde groups in the selective oxidation process, which provided support for the plausible catalytic mechanism.
根据可持续发展的要求，在温和条件下从废水中回收精细化学品是一项极具意义的研究方向。构建了一种低成本、高效率的负载多齿螯合和聚合物钴（II）基配合物（Co-L）的CN光催化剂（Co-L/CN），并用于在室温下转化废水中的芳香扁桃酸。BET比表面积从28 m²/g增加到68 m²/g，表明其具有优异的吸附特性。Co-L/CN的光吸收范围达到650 nm，而带隙能量降低到2.30 eV，这导致光催化活性显著增强。由于Co-L/CN的光活性，取代扁桃酸的转化率超过90%。时间分辨PL光谱表明Co-L/CN中光生电子-空穴对的显著分离。此外，紫外可见光谱和傅里叶变换红外光谱表明在选择性氧化过程中形成了醛基，这为合理的催化机理提供了支持。
